Transportable guiding device for cutting burners



. EEBERLE 'IRARSPOR'I'ABLE GUIDING DEVICE FOR CUTTING BURHERS mumm 12, was

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Patented Aug. 19, 1930 STATES WILHEIIM EBERLE, OF FRANKFORT-ON-THE-MAIN, GEIZMANY TRANSPORTABLE GUIDING DEVICE FOR CUTTING BURNERS Application filed J'u1y 12, 1928, Serial No. 292,316, and in- Germany December 24,1927.

It is impossible to produce clear and smoothcuts with the commonly used cutting burners moving on two loose rollers, as the fusing burner cannot move uniformly and steadily, owing to the muscle refiexes of the hand.

By this invention the obtention of a uni form and clean cutting line is made possible by means of an interchangeable device, adapted to be mounted on any cutting burner. It is essential that a rotating element, having a centrifugal mass or constructed as handwheel is coupled with rolling elements of the transportable frame by a speed reducing transmission-gear for.common rotation. At the forward movement to be initiated by the hand-wheel a slow movement is produced by the transmission-gear so that the variations of movement and speed, occurring at the starting of the movement, can no longer have any effect. In the same sense acts the addi-' tional centrifugal mass which, by the action of the energy accumulated at the rotation, makes italso possible tostart the uniform movement of the transportable frame from the side where the running rollers are, i. e, without hand-crank-drive. The uniformity of the movement of the rollers of the transportable frame may be indicated by optic or acoustic signals from the centrifugal mass.

Several .embodiments of the invention are illustrated, by way of example, in the accompanying drawings, in which:

Figs. 1, 2 and 3, 4 show each one form of construction of the guiding mechanism for the cuttin burner in a partly cut front-elevation an side-elevation respectively.

Fig. 5 shows in side-elevation a modification of the construction shown in Figs. 3 and 4.

In the transportable frame composed of two parts a, 6 (Figs. 1 and 2) a fiy-wheel f is rotatably mounted so that it can be rotated by means of a handle d. A small pinion g, directly driven from the flly-wheel f and mounted in the transportab e frame, meshes with the spur-wheel 9 on the axle of which a pinion g is keyed which meshes with a pinion g. This spur wheel g drives a running wheel 2' which has a roughened or milled rim. In a lateral lug-shaped arm a of part b of the transportable frame a burner-head c is guided in vertical direction. In the lower portion of part a of the transportable frame a supporting roller k of 1 smaller diameter than the running wheel i is mounted. A bell a mounted on part a of the transportable frameis struck intermittentlyby a clapper 0, adapted to be oscillated around its pivot-axle p by ribs on the circumference of the fly-wheel f.

The cutting with this apparatus is effected either by moving the burner itself and with the same the transportable frame over the work or by using the fly-Wheel rotated by its crank-handle for starting the movement. In both cases the rotated fly-wheel prevents by the uniform movement of its mass and through the intermediary of the transmission-gear g, g 9 g a sudden acceleration or retarding so that any disturbing jerk and any irregularity in the starting of the movement are excluded. The uniformity of the movement is signalized by the unifonn striking of the clapper 0 on the bell s. It might however be indicated by an optical signal in using the fly-wheel or a wheel driven by the same as armature of a small size light dynamo.-

As shown in Figs. 3 and 4 the hand-wheel F without centrifugal mass is substituted for the fly-wheel f. In this case only the gear 9, g 9 9 effects by its high transmission into slow speed a forward movement of the transportable frame and consequently of the burnefihead which is very slow in comparison with the rotation of wheel F, starting of the movement of the burner being, however, in this case practically possible only from the side of the hand wheel F. As can be seen from Fig. 5 a simple crank handle 1), 03 may be substituted for the hand wheel F, and when the transportable frame is of greater length the movement might be transinitted from a driving wheel by a belt or cord upon a Wheel corresponding to the wheel F.

The transmission gear g-g in the trans portable frame is not limited to the form of construction shown, provided that, even at rapid rotation of the wheel which initiates the movement, specially of the wheel without centrifugal mass, only such a little forward movement is obtained as necessary for ex-- cluding the irregularities in the driving.

With the aid of guide rollers of the transportable frame running on guide rails any predetermined curved cuts can be accurately made. 7

A portable cutting burner mechanism com prising a burner support having a traction wheel for engaging a workpiece, said su port being adapted to be manually moved in generating the line of cut, and of means for imparting a substantially uniform rate of rotation to said traction wheel comprising a fly wheel operatively connected to said traction wheel and acting as an inertia mass to rotate the traction wheel substantially uniformly during the moving period, said fly wheel rotating in a plane parallel to the movement of said burner and being located at one side of said support.

In testimony whereof I afiix my signature;

WILHELM EBERLE. 

